GHSA-r8w8-74ww-j4wh
PhpSpreadsheet HTML writer is vulnerable to Cross-Site Scripting via JavaScript hyperlinks
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Packagist | phpoffice/phpspreadsheet | >= 2.2.0, < 2.3.0 | 2.3.0 |
| Packagist | phpoffice/phpspreadsheet | < 1.29.2 | 1.29.2 |
| Packagist | phpoffice/phpspreadsheet | >= 2.0.0, < 2.1.1 | 2.1.1 |
| Packagist | phpoffice/phpexcel | <= 1.8.2 | no fix listed |
Details
As written in the advisory (Markdown source, shown as plain text).
### Summary
`\PhpOffice\PhpSpreadsheet\Writer\Html` does not sanitize "javascript:" URLs from hyperlink `href` attributes, resulting in a Cross-Site Scripting vulnerability.
### PoC
Example target script:
```
<?php
require 'vendor/autoload.php';
$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader("Xlsx");
$spreadsheet = $reader->load(__DIR__ . '/book.xlsx');
$writer = new \PhpOffice\PhpSpreadsheet\Writer\Html($spreadsheet);
print($writer->generateHTMLAll());
```
Save this file in the same directory:
[book.xlsx](https://github.com/PHPOffice/PhpSpreadsheet/files/15099763/book.xlsx)
Open index.php in a web browser and click on both links. The first demonstrates the vulnerability in a regular hyperlink and the second in a HYPERLINK() formula.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-r8w8-74ww-j4wh
- https://nvd.nist.gov/vuln/detail/CVE-2024-45292
- https://github.com/PHPOffice/PhpSpreadsheet/commit/392dd08c5569b623060784e1333454d64df1f03d
- https://github.com/PHPOffice/PhpSpreadsheet/commit/8b9b378ecdc603234a34aab3b293d2cdc8e9210e
- https://github.com/PHPOffice/PhpSpreadsheet/commit/f0b70ed1086348904b27772b264e1605ba6c1d6d
- https://github.com/PHPOffice/PhpSpreadsheet